What is the difference between Azure Classic Vs Azure Resource Manager? The difference between Azure Classic and Azure Resource Manager is in the way VMs are deployed and managed. Microsoft recommends that you create all VMs using the Azure Resource Manager, the exception to this is where you need to create a new VM that must by managed along with another Azure Classic VM. In fact, Microsoft recommends that where possible, you should recreate all Azure Classic VMs to turn them into VMs deployed and managed with Azure Resource Manager.
Azure Resource Manager has the following advantages vs using Classic:
Deployment, management and monitoring of services, as a group
Defining dependancies for deployments, so resources are deployed in the correct order
Role based access to services
Tags have been introduced to help with organisation of resources